An overview that displays categories or folders with filters in a column layout, showing—immediately below the header—only the 10 most recent emails (with the option to load more via scrolling). When an email is clicked, its content should be displayed in a preview pane situated beneath the list. This would provide a perfect overview for project-related communication.

example
Proj1 Proj2 Proj3 .....
mail1 Mal1 Mail1
mail2 Mail2 Mail2
mail3

VIEWER